Draft-regulator.



P. M. HEATH.

DRAFT REGULATOR.

LPPLIGATION FILED SEPT. 1, 1908.

979,069. Patented Dec. 20, 1910.

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DRAFT REGULATOR.

APPLIUATION FILED SEPT. 1. 190s.

Patented Dec. 20, 1910.

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F. M. HEATH.

DRAFT REGULATOR.

uPLIoATIoN FILED SEPT. 1, 190e.

Patented Dec. 20, 1910.

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F. M. HEATH.

DRAFT REGULATOR.

ArPLIoATIoN FILED SEPT. 1. 190B Patent-.ea mazo, 1910.

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FRANK ivi. HEATH, or PORTLAND, oaEGoN.

DRAFT-REGULATOR.

Specification of Letters Patent.

Patented Dee. 20, 1910.

Application iied September 1, i908. i Serial No. 451,196.

To all @071cm it may concern:

Be it known that lf; FRANK M. HEATH; of Portland; in the county ofMultnomah and in the State of Oregon; have invented a certain new anduseful Improvement in Draft-Regulators; and do hereby declare that thefollowing is a full; clear;'and exact description thereof.

My invention relates to means for regulating or controllingautomatically the draft openings of stoves; furnaces; or other heatgenerators; my object being the attainment of as perfect regulation asis possible automatically; to maintain a desired degree of heat andprevent the waste of fuel; and to such end my invention consists in theautomatic draft controlling means constructed substantially ashereinafter specified and claimed.

Referring` to the drawings; Figure 1 is a perspective view of anYordinary heating stove provided with an automatic regulator embodying myinvent-ion; Fig. 2 is a view in vertical section of a portion of acooking range provided with my invention; Fig. 3 a horizontal section onthe line 3 3 of Fig. 2; Fig. 4 a detail section similar' to Fig. 2 buton a larger scale; Fig. a view partly in side elevation and partly insection on the line of Fig. 3; Fig. 6 a vertical section of a stovehaving its draft inlet at the bottom; and taking air near the floor;when provided with my invention; Fig. 7 a horizontal section; Fig. S isa detail view of the automatic damper operating mechanism in one of itspreferable forms; Fig. 9 is a detail section on the line @#9 of Fig. 8;Fig. 10 a detail enlarged view of the damper latching or holding pafwlor dog illustrated in Fig. 8; Fig. 11 a view partly in side elevationand partly in section showing my invention embodied in a draft regulatorfor steam boiler furnaces and Fig. 12 is a detail enlarged view of saiddraft regulator.

1n the embodiments of my invention which I have selected forillustration; l prefer to locate my draft controlling devices in thedraft inlet 10 of the stove or furnace; and as will be best seen byreference to Figs. 2; 5 and 8; I pivot in the draft inlet a door ordamper in the form of a simple plate 11; the pivoting means being ahorizontal rod 12; from which the plate is suspended so that it mayswing to and from position to 12; preferably outside the draft inlet; isa radial arm 13; on which is mounted a weight 14 that may be adjustedtoward and from the pivot rod 12 so as to fix the damper 11 in apredetermined position with reference to the inlet; when, as ishereinafter pointed out; the damper is free to move. By means of theweight 14C; the damper 11 may be so counterbalanced that it willnormally stand. when subjected to no other infiuences than the force ofgravity; at a predetermined angle in the draft inlet and thereby form adraft area through the draft inlet of a desired size. Also attached tothe damper pivot rod 12; and on the outside of the stove; is a radiallyprojecting finger or arm 15. which is adapted to be engaged by a latchor pawl 16 when the damper is swung to a position to give the maximumarea to the draft inlet or passage; and said latch or pawl at its endopposite its arm-engaging end is pivotally connected to rod or bar 17which is adapted to be moved to a point to release the arm 15 when apredetermined temperature is produced in the stove or furnace; andthereby release the damper 11 and permit it to move to the pointpermitted by the location of the counterbalance weight 14 to restrict orcontract the area of the draft inlet. In the form of my inventionillustrated in Figs. 1 to S; the rod or bar 17 is either a thermostatand located in the stove or furnace where it is exposed to the heatthereof; or it is connected to a thermostat located in the stove orfurnace for the proper action of the heat upon it. In the form of myinvention illust 'ated in Fig. 11; the rod 17 is a piston rod of apiston 18; located in a cylinder 19. One side of the piston is subjectedto steam pressure taken from the boiler 20 by means of a pipe 21, whilethe other side is subjected to the action of a spring 2Q.

The latch or pawl 16 is fulcrumed infermediate its ends and its fulcrumconsists preferably of a pin or stud 23 against which the latch or pawllies; and said fulcrumforming pin or stud may be conveniently mounted;as illustrated in Fig. 8; upon a plate 24 adjustably secured to thestove or furnace by bolts or screws 25 passing through slots 26 in saidplate. For the purpose of adjustment; the pawl 16 may; as shown in Figs.8 and 10; be in the form of a bar or arm having attached to it aflexible strip 27 which is acted upon on opposite y close the inlet.Attached to the pivot rod l sides by screws 28 and 29; by which it maybe moved in either of two directions and lthere held. If preferred, saidstrip 27 may be ofspring metal, in which case the screw 28 may beomitted.

In order to regulate or control the draft to a degree beyond thecapacity of the damper 11, I employ a supplemental damper 30 in thedraft passage 10, which consists of a plate 31 hung by arms 32 at itsopposite ends from the pivot rod 12, which by swinging to and frorelative to the damper 11, will vary the size of the opening bet-Weenthe damper 11 and the damper plate 81. The movements of the damper 30are also automatically produced according to the state of thetemperature in the stove or furnace, by means of the rod 17, to which itmay be connected, as illustrated in Fig. S, by means of an angle shapedbar or arm 33, said arm being secured at one end to the rod 17, and atits other end provided with a slot 84: that engages a stud or pin 35 onone of the dampersupporting arms 32.

It will be seen that the contraction of the draft opening from itsmaximum area by releasing the damper 11 until it swings to a closedposition as far as the weight 14E will permit it, and then the meer orcloser regulation of the size of the draft opening are both effectedautomatically from the movement of the rod 17, produced either by thedirect action of the heat thermostatically, or by means of pressure ofsteam, as when the draft of a steam boiler furnace is being regulated.

As is clearly illustrated in Fig. 3, the arm which carries theeounterbalance weight 1-1; is extended to both sides of the axis of thepivot rod, so that it is possible, by shifting the weight 1-1, to placeit in a position where it will hold the damper 11 in a closed position.

ln the embodiment of my invention shown in Fig. 1, it is applied to aheating stove with the air inlet in front at the bottom; as illustratedin Figs. 2 to 5, it is applied to a range with the draft inlet enteringbelow the tire box, and having a downward extension 3G reaching nearlyto the floor for the removal of cold and foul air therefrom, an ordinaryadjustable draft opening 3T being provided in the all in line with thedraft inlet 10,'` and in the embodiment of my in vention shown in Figs.(3 and 7. it is adapted to a heating stove. having its air inlet 10 atthe bottom to which air is conducted through an inverted U-shaped flue38 from near the floor. and in this instance the thermostatie rod 17 iscurved to lie close to the stove wall, instead of being` carriedstraight across, which in some types of stove is objectionable. ',ihedoor or damper 11 may be provided with a small hole 39, and as shown inFig. 1. said hole may be closed wholly or partially by a cover 10.

The operation of my invention is as follows: When the lire is started,'the door or damper 11 is secured in its wide open position by means ofthe `pawl 1( lllhen the temperature rises to a point where it is desiredto check the strong draft thus aiforded, the thermostat expands, or thepiston is moved sufficiently to roet: the pawl on its fulcrum to releasethe arm 15, and thus allow the damper 11 to swing to a partially closedposition, it being arrested at the des sired point by the action of itscounterbalance 14e. Thereafter any rise in temperature will result inthe automatic movement of the damper 30 toward the damper l1, tocontract the area of the draft inlet to suit the temperature.

'Vhen the eounterbalance weight 1-1 is adjusted to a position whichprevents the entire closing of the damper 11 by the action of gravity,it will be evident that the damper 1-1 under the pressure of a strong d'aft passing through the draft inlet 10 will more toward the damper 30.Thus contraction of the area of the draft inlet will be produced by theconjoint operation of the two dampers. In .like manner, in case of asudden or heavy wind causing a rush of air through the flue, the damper11 will move toward the damper 30 and thus check the sudden rush of theair which otherwise would result in a needless consumption of fuel andwaste of heat up the flue, and it will be seen by the, employment of myinvention all the conditions which would result in needless consumptionof fuel and waste of heat produced are provided for by mitomaticallyoperated mechanism and a regular and uniform degree of temperaturemaintained. I locate my dra ft-controlling means in the draft inlet sothat there may be no obstruction whatever in the flue or chimney leadingfrom the stove or heater, as thereby any tendency to deposit soot in theflue is avoided, and there is no tendency to smoke when the fuel door isopen.

The weight 111 is adjusted to control the damper 11 according to therequirements of the particular stove or heater, the temperature desiredto be maintained, and the character of the fuel used.

By means of the adjustment of the pawl 1G, which is provided for by theconstruction illustrated in Figs. 8, and 10, the angle of inclination ofthe door or damper 11 when held wide open may be varied.

Having thus described my invention, what I claim is- 1. In a draftregulator, the combination of two dampers eoperating with the same flueor passage, one being movable toward and from the other to vary the sizeof the draft passage, automatic heat-operated means for causing movementof one of said dampers to a predetermined position with reference to theflue or passage, and a device actuated by said heat-operated meansadapted for controlling the movements of the other damper subsequently.

2. In a draft regulator, the combination of a damper, means for latchingthe damper in an open position, automatic heatcontrolled means forreleasing the damper7 means to arrest the damper before it reachesl afully closed position, and automatic means to vary the size of the draftopening formed by the damper in its arrested position.

3. In a draft regulator, the combination of a damper, a latch forholding it in an open position, a second damper cooperating with thefirst to regulate the size of tliei draft opening, and automaticheat-operated means for releasing the latch level' and moving the seconddamper.

4. In combination with a stove or the like having a draft inlet, a pairof dampers mounted in said inlet, means for latching one of said dampersin an open position, and automatic heat-controlled means for unlatchingsaid damper and for moving the other damper.

In testimony that I claim the foregoing' I have hereunto set my hand.

FRANK M. HEATH.

IVitnesses TRUMAN J. GLovnr., LESTER L. CURL.

